Hi all, can I get some help from someone? I tried apple cider vinegar on my face acne, there was this inflamed acne that has grown so big which I needed to get rid of, so I applied some undiluted vinegar on it, and left it there for few hours. At the end of the day, it did shrink the acne, but left a dry dark-red spot (looks like a a blood clot or burnt area) on my face. Do you think it will go away? What can I do to make it go away? Any advice is appreciated.